Rotary pump.



J R. KINNEY.

m PUMP.

Patented Apr. 27, 1915.

2 SHEETS-SHEET 1.

1. R. KINNEY.

ROTARY PUMP.

APPLICATION mu)- MAR. 4. I914.

SHEET 2.

1,137,215. Patented 27, 1915.

UNITED STATES PATENT OFFICE.

JUSTUS It. KINNEY, OF DORCHESTER, MASSACHUSETTS, ASSIGNOR TO THE KINNEY MANUFACTURING COMPANY, OF BOSTON, MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS.

ROTARY PUMP.

To all whom it may concern:

Be itknown that I, JUs'rUs R. KINNEY, a

Suffolk and State of Massachusetts, have invented certain new and useful Improve-' ments in Rotary Pumps, of which the following isa specification.

This invention relates to rotary pum s, and has for its object the production of 'a pump which will be simple, in construction and very effective in operation, and in which the annular piston will be'supported upon a film of liquid under pressureinterposed between its inner cylmdrical wall and the periphery of its operating eccentric.

.The invention consists in providing the inner cylindrical wall of the annular piston with a transverse groove communicating'by apassage with; the outlet compartment whereby the liquid being pumped may enter between the periphery of the eccentric and the cylindrical?*"-'; 1ner wall of the annular piston and support the latter during the operation of the pump, thus providing a means whereby the liquid thus entering between said eccentric and piston will be maintained at a constant pressure.

The invention further consists in certain novel features of construction and arrangement of parts which will be fully understood by reference'to the descriptionof the drawings and to the claims hereinafter given. 1

Of the drawings: Figure 1 represents a vertical section of a pump embodying the features of the present. invention, the cutting plane being on line 11 on Fig. 2. Fig. 2 represents a transverse section of the same, the cutting plane being on line 22 on- Fig. 1, and Fig. 3 represents a View of a portion of the inner wall of said annular piston.

Similar characters designate like parts throughout the several figures of the drawin s.

. In the drawings, 10 represents a casing supported by the feet 11 and having a cyl1ndrical piston chamber 12 and the inlet and 16 forms a means of communication between Specification of Letters Patent.

Application filed March 4, 1914. Serial No. 822,539.

the piston chamber and the outlet compartment.

Extending through the piston chamber 12 1s a shaft 17 revoluble in bearings 18 on the casing 10 and in the end plate 19 secured to said casing 10;. The shaft 17 has secured thereto Within the piston chamber 12 an eccentric 20.

wall of said piston chamber during the rotation of the shaft 17 In the outlet passage 16 is a .cylindrical recess 22 in which is positioned an oscillatmg cylinder 23 having adiametral slot 24 extending therethrough. A radial blade 25 rigidly secured to the annular piston 21 extends through the slot 24, this blade being provided with a depression 26 in one face thereof through which the material being pumped is adapted tobe discharged into the outlet compartmentl l. An outlet pipe 27 communicates with the compartment 14 and material is admitted to the compartment 13 through the inlet pipe 28. The blade 25 accurately fits the slot 24 and is adapted to reciprocate therein and as the material be ing pumped is discharged through the depression 26 the blade 25'is forced against.

- pression 26 in the blade 25 the construction of the pump is greatly simplified by .dispensing with a separate discharge" outlet while at the same time means is provided whereby the blade in its reciprocation is thoroughly lubricated by the material being pumped. Moreover, by this construction there is no opportunity for the material to become pocketed. The inner cylindrical wall of the annular piston 21 is provided with a groove 29 WlllCh terminates within the side walls of said annular piston 21 as indicated in Fig. 3 of the drawings. From the groove 29 aradial hole or passage'30 ex tends to the 1 depression 26 of said piston blade, thereby communicating with the outlet compartment-14, so that as the material piston portions thereof will be forced under constant pressure through the passage 30 into the groove 29, effecting a thorough lubrication of the inner wall of the annular member 25 as the eccentric 20 revolves therein.

By having the space 31 between the periphery of the eccentric 20 and the annular member 21 connected by the passage 30, the fluid under constant pressure in the outlet compartment 14 is permitted to enter this space 31 when the pump is in operation and support the said annular member 21 on a thin film of said fluid throughout the cycle of said eccentric 20 within said annular member. As a consequence of this construction with the film of fluid under constant pressure over the entire periphery of the eccentric 20 the annular member is supporte on a hydraulic cushion and retained at all times concentric with the axis of said eccentric, and the adjacent surfaces are prevented. from coming into frictional contact and becoming worn. This is of great importance, for otherwise the annular member and the eccentric become worn unevenly and result in an imperfect operation of the pump. Constructed as herein shown and described, the eccentric will rotate within the annular member for an indefinite period without any appreciable wear.

It is believed that the operation and many advantages of the invention will be fully understood from the foregoing description.

Having thus described my invention, I claim:

1. In a device of the class described, the combination of a casing provided with a cylindrical piston chamber and an outlet compartment communicating therewith; a revoluble shaft centrally disposed therein; an eccentric thereon; and an annular piston on said eccentric having a radial blade extending into said outlet compartment and provided with a groove extending transversely of its inner cylindrical wall communicating with .the outlet compartment by means of a passage through said blade.

2. In a device of the class described, the combination of a casing provided with a cylindrical piston chamber and an outlet compartmentcommunicating therewith; a revoluble shaft centrally disposed therein; an eccentric thereon; and an annular piston on said eccentric having a radial blade extending into said outlet compartment and provided with a groove extending transversely of its inner cylindrical wall communicating constantly with the outlet compartment by means of a passage through said blade.

3. In a device of the class described, the

combination of a casing provided with a cylindri cal piston chamber and an outlet compartment communicating therewith; a revoluble shaft centrally disposed therein; an eccentric thereon; and an annular piston or.

said eccentric having a radlal blade extending into said outlet compartment and provided with a groove extending transversely of its inner cylindrical wall communicating constantly with the outlet compartment.

4:. In a device of the class described having an inclosed outlet compartment, the combination of an eccentric, an annular piston, and means for supplying a filmof liquid between said eccentric and piston under constant pressure through a passage communieating directly with said outlet compartment. 4

In a device of the class described having an outlet compartment, the combination of an eccentric, an annular piston, and means for supplying directly from said outlet compartment a film ofliquid between said eccentric and piston under constant pressure.

6. In a device of the class described, the combination of a casing provided with a cylindrical piston chamber, an inlet passage thereto, an outlet compartment, and a smaller cylindrical recess communicating with said piston chamber; a cylindrical oscillating member positioned in said recess provided with a transverse slot; a revoluble shaft centrally disposed in said piston chamber; an eccentric thereon; and an annular piston on said eccentric having a radial blade extending through the slot in said oscillating member, and provided with a passage from its inner annular wall extending through said blade and communicating with said outlet compartment.

7. In a device of the class described, the combination of a casing provided with a cylindrical piston chamber, an inlet passage thereto, an outlet compartment, and a smaller cylindrical recess communicating with said piston chamber; a cylindrical oscillating member positioned in said recess provided with a'transverse slot; a revoluble shaft centrally disposed in said piston chamber, an eccentric thereon; and an annular piston on said eccentric having a radial blade extending through the slot in said oscillating member, and provided with a depression in its outlet side and having a passage from its inner annular wallextending through said blade and communicating with said depression.

Signed by me at Boston, Mass, this 19th day of February, 1914.

JUSTUS R. KINNEY.

Witnesses:

WALTER E. LOMBARD, NATHAN C. LOMBARD. 

